THE ^CIDIAL STAGE OF RUSTS. 



37 



Table III. — Summary of experiments to determine the vitality of successive tiredo genera- 

 tions of various grain rusts — Continued. 



PUCCINIA GRAMINIS HORDEI ON BARLEY. 



1 Pustules \igorous. 



2 Series sent from Washington, D. C, to Minneapolis, Minn., .\pril 8, 1907. 



3 Three inoculations were made from material from dried leaves. 7 from fresh material shipped in pots, 

 < Plus sign signifies "more than;" i. e., exact number of leaves j)ustiiled not noted. 



5 Sings destroyed S plants. 



6 Slugs destroyed 1 plant . 



' Series sent from Minneapolis, Minn., to Washington, D. C, October 8, 1907. 

 B Several. 



9 Pustules not as vigorous as usual. 



10 Pustules not \-igoroiis. 



11 Series transferred from Washington, D. C, to Minneapolis, Minn., March 19, 1908. 



12 Failure due to extreme heat in greenhouse. 



13 Inoculated fromgg. 



" Experiment discontinued. 



216 



